<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#div1{
width: 200px;height: 200px;
background: red;
transition: 2s all 1s linear;
}
#div1:hover{background: blue;width: 260px; height: 260px;}
</style>
</head>
<body>
<div></div>
<button>淅变</button>
</body>
<script type="text/javascript">
window.onload=function(){
div1=document.getElementById("div1");
tran=document.getElementById("tran");
tran.onclick=function(){
div1.style.background="pink";
div1.style.width="300px";
div1.style.height="300px";
}
}
</script>
</html>